<p>If 3x = y, which of the following equals 9y in terms of x?</p>
<p>(A) 3x/2
(B) 32x
(C) 32+x
(D)3x2
(E)27x</p>
<p>(#) x is actually power of 3, sorry, I type subscript in World but here it does not work.</p>
<p>(*)Question 10, Section 7 SAT Reasoning Test Saturday November 1996</p>
<p>E…</p>
<p>The right question is actually C, I chose E first, but it is wrong</p>
<p>It’s really confusing what your exponents are. Use 3^x if you want to say " 3 to the power of x".</p>
<p>It’s C because 3^x=y, so 9y=(9)(3^x). 9 can be rewritten as 3^2, and since the product of two powers with the same base is the sum of the exponents, 3^2(3^x)=3^(2+x).</p>